US9395860B2 - Capacitive touch panel input device with improved signal-to-noise detection and input detection method thereof - Google Patents

Capacitive touch panel input device with improved signal-to-noise detection and input detection method thereof Download PDF

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US9395860B2
US9395860B2 US14/487,579 US201414487579A US9395860B2 US 9395860 B2 US9395860 B2 US 9395860B2 US 201414487579 A US201414487579 A US 201414487579A US 9395860 B2 US9395860 B2 US 9395860B2
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driving signal
driving
interval
electrodes
signal
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US20150077390A1 (en
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Bonkee Kim
Jeong Hwan Lee
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Hideep Inc
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Hideep Inc
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the present invention relates to a touch panel input device and an input detection method thereof, and more particularly to a touch panel input device capable of improving a signal-to-noise ratio of a touch panel and an input detection method thereof.
  • the input device has been developed from data processing through the input device, e.g., a keyboard, a keypad, etc., to an available touch panel functioning as both an input device and an output device.
  • the touch panel commonly designates an input device allowing a user to input by touching a screen of a display device without separate input equipments.
  • the touch panel detects whether the touch is input or not by detecting a capacitance stored in a plurality of node capacitors formed by row lines and column lines which are arranged to cross each other in the form of a matrix.
  • a capacitance stored in a plurality of node capacitors formed by row lines and column lines which are arranged to cross each other in the form of a matrix.
  • the capacitance of the node capacitor is changed due to the influence of noise, etc., generated from the display device, there is a possibility of malfunction of the touch panel.
  • One embodiment is a touch panel input device that includes: a touch panel which includes a plurality of node capacitors, each of which is formed by one of a plurality of driving signal electrodes and one of a plurality of sensing signal electrodes; a driving signal supplier which drives simultaneously at least two of the plurality of driving signal electrodes by applying driving signals; and a sensing signal part which receives a sensing signal including information on capacitances of the plurality of node capacitors through the plurality of sensing signal electrodes.
  • the driving signal is driven to include a plurality of time intervals in which the driving signal is applied to at least one of the at least two driving signal electrodes simultaneously driven, and in which the driving signal is not applied to at least one of the at least two driving signal electrodes simultaneously driven.
  • the driving signal supplier causes that a combination of the driving signal electrode to which the driving signal is applied in one of the plurality of time intervals and the driving signal electrode to which the driving signal is not applied in the one of the plurality of time intervals is different from a combination of the driving signal electrode to which the driving signal is applied in the other of the plurality of time intervals and the driving signal electrode to which the driving signal is not applied in the other of the plurality of time intervals. At least one among the driving signals which are simultaneously applied to the driving signal electrode has a phase difference from the other driving signals.
  • the combination of the driving signal electrode to which the driving signal is applied and the driving signal electrode to which the driving signal is not applied is formed through a Pseudo-Random Bit Stream (PRBS) code.
  • PRBS Pseudo-Random Bit Stream
  • phase difference is 180 degree.
  • the sensing signal part further includes an amplifier.
  • the amplifier sums up the capacitances of the plurality of node capacitors to which the applied driving signal is transmitted.
  • the sensing signal part further includes an A/D converter which is connected to the amplifier and converts the signal transmitted from the amplifier into a digital signal.
  • the touch panel input device further includes a controller.
  • the controller controls an output from the driving signal supplier and detection of the sensing signal part.
  • Another embodiment is a touch input detection method for detecting the touch location by detecting the capacitance of the node capacitor in the touch panel comprising the plurality of node capacitors, each of which is formed by one of the plurality of driving signal electrodes and one of the plurality of sensing signal electrodes.
  • the method includes: driving the plurality of driving signal electrodes by applying driving signals, causing that, in a first interval, the driving signal is applied to at least two driving signal electrodes of the plurality of driving signal electrodes and the driving signal is not applied to at least one driving signal electrode of the plurality of driving signal electrodes, and causing that one of the driving signals which are applied to the at least two driving signal electrodes has a phase difference from the other driving signals; causing that, in a second interval, the driving signal is not applied to at least one of the driving signal electrodes to which the driving signal has been simultaneously applied in the first interval and the driving signal is simultaneously applied to at least two driving signal electrodes, among the plurality of driving signal electrodes, comprising at least one of the driving signal electrodes to which the driving signal has not been applied in the first interval, and causing that one driving signal among the driving signals which are applied to the at least two driving signal electrodes has a phase difference from the other driving signals; detecting a first sensing signal comprising information on the capacitances of the node capacitors,
  • a combination of the driving signal electrode to which the driving signal is applied and the driving signal electrode to which the driving signal is not applied corresponds to a Pseudo-Random Bit Stream (PRBS) code.
  • PRBS Pseudo-Random Bit Stream
  • the driving signals having a phase difference correspond to a code obtained by multiplying the PRBS code by ⁇ 1.
  • FIG. 1 is a view showing a structure of an embodiment of a touch panel input device according to an embodiment of the present invention
  • FIG. 2 a is a view showing an embodiment of a PRBS code
  • FIG. 2 b is a view showing an inverse matrix of the PRBS code shown in FIG. 2 a;
  • FIG. 3 a is a view showing a matrix showing a code generating a driving signal in a driving signal supplier
  • FIG. 3 b is a showing a matrix which shows showing a waveform of a driving signal corresponding to the matrix shown in FIG. 3 a;
  • FIG. 4 is a circuit diagram showing a connection relationship among the node capacitor, the driving signal supplier and the sensing signal part, all of which are shown in FIG. 1 ;
  • FIG. 5 is a flowchart showing a method for detecting an input in the touch panel input device shown in FIG. 1 .
  • FIG. 1 is a view showing a structure of an embodiment of a touch panel input device according to an embodiment of the present invention.
  • a touch panel input device 1000 includes a touch panel 100 , a driving signal supplier 200 and a sensing signal part 300 .
  • the touch panel 100 includes a plurality of node capacitors 101 .
  • Each node capacitor 101 is formed by one of a plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and one of a plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn.
  • the driving signal supplier 200 may simultaneously drive at least two of the plurality of driving signal electrodes by applying a driving signal.
  • the sensing signal part 300 may receive a sensing signal including information on capacitances of the plurality of node capacitors 101 through the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn.
  • the touch panel 100 includes the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn and may be disposed on or within a display unit.
  • the location of the touch panel 100 is not limited to this.
  • a liquid crystal display (LCD), an organic light emitting display (OLED) and the like may be taken as an example of the display unit in which the touch panel 100 is formed.
  • the example of the display unit is not limited to this.
  • the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn of the touch panel 100 form an orthogonal array.
  • the embodiment of the present invention is not limited to this.
  • RXn ⁇ 1 and RXn may have an array of arbitrary dimension, for example, a diagonal array, a concentric array, a 3-dimensional random array, etc., and an array obtained by the application of them.
  • the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn may be formed of a transparent conductive material (for example, indium tin oxide (ITO) or antimony tin oxide (ATO)) and the like. However, there is no limit to this.
  • ITO indium tin oxide
  • ATO antimony tin oxide
  • the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn may be formed of another transparent material or an opaque conductive material like copper, etc. Also, although it is shown that the number of the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn is the same as the number of the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn, there is no limit to this. The numbers may be changed according to the shape of the touch panel 100 .
  • the plurality of node capacitors 101 may be formed by the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn.
  • the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn are represented respectively by lines, they may be actually implemented with an electrode pattern.
  • the width of the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn may be different from the width of the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn.
  • the driving signal supplier 200 may apply driving signals to the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn.
  • the driving signals may be applied to one ends of the node capacitors 101 .
  • the driving signal which is generated by the driving signal supplier 200 at least two of the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn are simultaneously driven in each interval.
  • the driving signal may be controlled to include a plurality of time intervals in which the driving signal is applied to at least one of at least two driving signal electrodes simultaneously driven, and in which the driving signal is not applied to at least one of at least two driving signal electrodes simultaneously driven.
  • a combination of the driving signal electrode to which the driving signal is applied in one interval and the driving signal electrode to which the driving signal is not applied in the one interval may be set to be different from a combination of the driving signal electrode to which the driving signal is applied in at least another interval and the driving signal electrode to which the driving signal is not applied in the at least another interval.
  • the one interval may be designated as a first interval
  • the another interval may be designated as a second interval.
  • the combination of the driving signal electrode to which the driving signal is applied and the driving signal electrode to which the driving signal is not applied can be intended to correspond to a Pseudo-Random Bit Stream (PRBS) code.
  • PRBS Pseudo-Random Bit Stream
  • the “simultaneously” does not mean only the fact that the driving signal is applied to the at least two driving signal electrodes at the complete same time, and may mean that the driving signal is applied at a certain time interval.
  • the supplying of the driving signal may mean that a pulse is generated and transmitted to the driving signal electrode.
  • the pulse may be in a high-state or low-state.
  • At least one of the driving signals which are simultaneously applied may have a phase difference from the other driving signals.
  • the phase difference may be 180 degree.
  • the sensing signal part 300 detects the sizes of the capacitances of the plurality of the node capacitors 101 , which are transmitted through the sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn respectively.
  • the sensing signal part 300 sums up the capacitances of the node capacitors 101 detected in the first interval and sums up the capacitances of the node capacitors detected in the second interval, and then is able to determines the capacitance of each of the node capacitors 101 by using the capacitance summed in each interval.
  • the driving signals which are transmitted to the node capacitors 101 in each interval including the first and the second interval include the driving signals having a phase difference
  • the sum of the capacitances of the node capacitors 101 in the first interval or the second interval may be less than the sum the capacitances of the node capacitors 101 generated by the driving signal with no phase difference.
  • the touch panel input device 1000 may further include a controller 400 .
  • the controller 400 controls the driving signal supplier 200 and the sensing signal part 300 , thereby causing the driving signal supplier 200 to output the driving signal and causing the sensing signal part 300 to detect the capacitance of the node capacitor 101 through the plurality of sensing signal electrodes RX 1 , RX 2 , . . . , RXn ⁇ 1 and RXn.
  • FIG. 2 a is a view showing an embodiment of a code which is transmitted to the driving signal supplier shown in FIG. 1 .
  • FIG. 2 b is a view showing an inverse matrix of the code shown in FIG. 2 a.
  • a matrix shown in FIG. 2 b is formed by using a 4-bit Pseudo-Random Bit Stream (PRBS) code and has a size of 15 ⁇ 15.
  • PRBS Pseudo-Random Bit Stream
  • a matrix having a size of 31 ⁇ 31 can be obtained.
  • a matrix having a size of 7 ⁇ 7 can be obtained.
  • a combination of the driving signals which are simultaneously applied through seven driving signal electrodes may be formed by using a 7 ⁇ 7 matrix.
  • a combination of the driving signals which are simultaneously applied through fifteen driving signal electrodes may be formed by using a 15 ⁇ 15 matrix.
  • a combination of the driving signals which are simultaneously applied through thirty one driving signal electrodes may be formed by using a 31 ⁇ 31 matrix.
  • the matrix having a size of 15 ⁇ 15 will be described.
  • the 15 ⁇ 15 matrix can be formed by using the 4-bit PRBS code and is shown in FIG. 2 b .
  • the 15 ⁇ 15 matrix shown in FIG. 2 b through the substitution of ⁇ 1 by 0, the 15 ⁇ 15 matrix shown in FIG. 2 a can be obtained.
  • the matrix shown in FIG. 2 a is the inverse matrix of the matrix shown in FIG. 2 b .
  • the matrices of FIGS. 2 a and 2 b can be represented by the following equation (1).
  • M represents the matrix shown in FIG. 2 b .
  • M ⁇ 1 represents the matrix shown in FIG. 2 a , i.e., the inverse matrix of M.
  • VRX1(T1) to VRX1(T15) may mean a voltage of the sensing signal which is transmitted through a first sensing signal electrode in a first interval to a fifth interval.
  • C 11 to C 151 may mean the capacitances of the node capacitors connected to the first sensing signal electrode.
  • one row of the 15 ⁇ 15 matrix may correspond to the interval in which the driving signal is driven, and each column may correspond to one driving signal electrode. “0” in the matrix means that the driving signal is not driven, and “1” means that the driving signal is driven. Therefore, eight driving signal electrodes to which the driving signals are applied and seven driving signal electrodes to which the driving signals are not applied are represented in each column of the matrix M.
  • the first row at the top of the matrix of FIG. 2 a is the first interval and the second row under the first row is the second interval.
  • the first interval shows (1, 1, 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1) from left to right
  • the driving signal is driven to the first to third driving signal electrodes TX 1 to TX 3 , the fifth driving signal electrode TX 5 , the seventh driving signal electrode TX 7 , the eighth driving signal electrode TX 8 , the eleventh driving signal electrode TX 11 , and the fifteenth driving signal electrode TX 15 , and the driving signal is not driven to the fourth driving signal electrode TX 4 , the sixth driving signal electrode TX 6 , the ninth driving signal electrode TX 9 , the tenth driving signal electrode TX 10 , and the twelfth to fourteenth driving signal electrodes TX 12 to TX 14 .
  • the second interval shows (1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1) from left to right
  • the driving signal is driven to the first and second driving signal electrodes TX 1 and TX 2 , the fourth driving signal electrode TX 4 , the sixth driving signal electrode TX 6 , the seventh driving signal electrode TX 7 , the tenth driving signal electrode TX 10 , the fourteenth driving signal electrode TX 14 , and the fifteenth driving signal electrode TX 15 , and the driving signal is not driven to the third driving signal electrode TX 3 , the fifth driving signal electrode TX 5 , the eighth and ninth driving signal electrodes TX 8 and TX 9 , and the eleventh to thirteenth driving signal electrodes TX 11 to TX 13 .
  • driving signal electrodes that are not driven in the second interval among the driving signal electrodes which are driven in the first interval, and there are driving signal electrodes that are driven in the second interval among the driving signal electrodes which are not driven in the first interval. That is, while the driving signals are applied to the plurality of the driving signal electrodes by the driving signal supplying unit 200 in accordance with each of the columns of the matrix M, it is controlled that the driving signal is applied simultaneously to the at least two of the plurality of the driving signal electrodes in the first interval, and the driving signal is not applied to at least one driving signal electrode.
  • the driving signal is not applied in the second interval to at least one of the driving signal electrodes to which the driving signal has been simultaneously applied in the first interval among the plurality of the driving signal electrodes, and the driving signal is applied to at least one of the driving signal electrodes to which the driving signal has not been applied in the first interval. Therefore, a combination of the driving signal electrode to which the driving signal is applied in the first interval and the driving signal electrode to which the driving signal is not applied in the first interval may be different from a combination of the driving signal electrode to which the driving signal is applied in the second interval and the driving signal electrode to which the driving signal is not applied in the second interval.
  • the driving signal shown in the matrix formed by using the PRBS code can be simultaneously applied to the fifteen driving signal electrodes.
  • the information on the capacitance of the node capacitor can be obtained, thereby more quickly obtaining the location of the touch.
  • the PRBS code when used, 7 ⁇ 7 matrix and 31 ⁇ 31 matrix are usable, so that it is possible to control the number of the driving signal electrodes to which the driving signal is simultaneously applied, and the matrix can be variously applied depending on the size of the touch panel.
  • the matrix which is formed by using 4-bit PRBS code and shown in FIGS. 2 a and 2 b is nothing but an example, and may have other forms.
  • the matrix formed by using the 4-bit PRBS code satisfies that there are driving signal electrodes to which the driving signal is not driven in the second interval among the driving signal electrodes to which the driving signal is driven in the first interval and there are driving signal electrodes to which the driving signal is driven in the second interval among the driving signal electrodes to which the driving signal is driven in the first interval.
  • FIG. 3 a is a view showing a matrix showing a code generating a driving signal in a driving signal supplier.
  • FIG. 3 b is a showing a matrix which shows showing a waveform of a driving signal corresponding to the matrix shown in FIG. 3 a.
  • the driving signal supplier 200 receives the code and generates a first to a fifteenth driving signals tx 1 to tx 15 which are simultaneously transmitted.
  • the first to the fifteenth driving signals tx 1 to tx 15 are generated in response to the matrix shown in FIG. 3 a .
  • a part of the matrix shown in FIG. 3 a which corresponds to the codes of the first to the eighth driving signals, may be formed identically to the matrix of FIG. 2 a .
  • a part of the matrix shown in FIG. 3 a which corresponds to the codes of the ninth to the fifteenth driving signals, may be formed by multiplying the matrix of FIG. 2 a by ⁇ 1.
  • the ninth to the fifteenth driving signals may have a 180 degree phase difference from the first to the eighth driving signals having a positive (+) sign.
  • the first to the eighth driving signals tx 1 to tx 8 when the first to the eighth driving signals tx 1 to tx 8 have a value of 1, the first to the eighth driving signals tx 1 to tx 8 may have a value of 1 during half cycle and a value of 0 during the remaining half cycle due to a high pulse.
  • the code of the first driving signal tx 1 is (1, 1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 1)
  • the first driving signal tx 1 is driven in the first to the third intervals T1 to T3, the fifth interval T5, the seventh interval T7, the eighth interval T8, the eleventh interval T11 and the fifteenth interval T15, so that the high pulse is repeatedly generated.
  • the first driving signal tx 1 is not driven in the fourth interval T4, the sixth interval T6, the ninth interval T9, the tenth interval T10, and the twelfth to the fourteenth intervals T12 to T14.
  • the code of the second driving signal tx 2 is (1, 1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1)
  • the second driving signal tx 2 is driven in the first interval T1, the second interval T2, the fourth interval T4, the sixth interval T6, the seventh interval T7, the tenth interval T10, the fourteenth interval T14 and the fifteenth interval T15, so that the high pulse is repeatedly generated.
  • the second driving signal tx 2 is not driven in the third interval T3, the fifth interval T5, the eighth interval T8, the ninth interval T9, the eleventh to the thirteenth intervals T11 to T13.
  • the code of the third driving signal tx 3 is (1, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 1)
  • the third driving signal tx 3 is driven in the first interval T1, the third interval T3, the fifth interval T5, the sixth interval T6, the ninth interval T9, and the thirteenth to the fifteenth intervals T13 to T15, so that the high pulse is repeatedly generated.
  • the third driving signal tx 3 is not driven in the second interval T2, the fourth interval T4, the seventh interval T7, the eighth interval T8, and the tenth to the twelfth intervals T10 and T12.
  • the fourth to the eighth driving signals tx 4 to tx 8 are generated in response to the matrix shown in FIG. 3 a.
  • the codes of the ninth to the fifteenth driving signals tx 9 to tx 15 may be the same as a matrix obtained by multiplying the matrix shown in FIG. 2 a by ⁇ 1.
  • the ninth to the fifteenth driving signals tx 9 to tx 15 may have a value of ⁇ 1
  • the ninth to the fifteenth driving signals tx 9 to tx 15 may have a value of 0 during half cycle and a value of 1 during the remaining half cycle due to the high pulse.
  • the ninth driving signal tx 9 is driven in the third interval T3, the seventh to the tenth intervals T7 to T10, the twelfth interval T12, the fourteenth interval T14 and the fifteenth interval T15, so that the high pulse is repeatedly generated. Also, the ninth driving signal tx 9 is not driven in the first interval T1, the second interval T2, the fourth to the sixth intervals T4 to T6, and the eleventh interval T11.
  • the tenth driving signal tx 10 When the code of the tenth driving signal tx 10 is (0, ⁇ 1, 0, 0, ⁇ 1, ⁇ 1, ⁇ 1, ⁇ 1, 0, ⁇ 1, 0, ⁇ 1, ⁇ 1, 0), the tenth driving signal tx 10 is driven in the second interval T2, the sixth to the ninth intervals T6 to T9, the eleventh interval T11, the thirteenth interval T13, and the fourteenth interval T14, so that the high pulse is repeatedly generated. Also, the tenth driving signal tx 10 is not driven in the first interval T1, the third to the fifth intervals T3 to T5, the tenth interval T10, the twelfth interval T12, and the fifteenth interval T15.
  • the eleventh driving signal tx 11 When the code of the eleventh driving signal tx 11 is ( ⁇ 1, 0, 0, 0, ⁇ 1, ⁇ 1, ⁇ 1, ⁇ 1, 0, ⁇ 1, 0, ⁇ 1, 0, ⁇ 1), the eleventh driving signal tx 11 is driven in the first interval T1, the fifth to the eighth intervals T5 to T8, the tenth interval T10, the twelfth interval T12, the thirteenth interval T13, and the fifteenth interval T15, so that the high pulse is repeatedly generated. Also, the eleventh driving signal tx 11 is not driven in the second to the fourth intervals T2 to T4, the ninth interval T9, the eleventh interval T11, the twelfth interval T12, and the fourteenth interval T14. In the aforementioned manner, the twelfth to the fifteenth driving signals tx 12 to tx 15 are generated in response to the matrix shown in FIG. 3 a.
  • the codes of the driving signals which are simultaneously transmitted to the driving signal electrode in the first interval T1 may be (1, 1, 1, 0, 1, 0, 1, 1, 0, 0, ⁇ 1, 0, 0, 0, ⁇ 1).
  • the codes of the driving signals which are simultaneously transmitted to the driving signal electrode in the second interval T2 may be (1, 1, 0, 1, 0, 1, 1, 1, 0, 0, ⁇ 1, 0, 0, 0, ⁇ 1, ⁇ 1).
  • the codes of the driving signals which are simultaneously transmitted to the driving signal electrode in the third interval T3 may be (1, 0, 1, 0, 1, 1, 1, 0, 0, ⁇ 1, 0, 0, 0, ⁇ 1, ⁇ 1, ⁇ 1).
  • the codes of the driving signals which are simultaneously transmitted to the driving signal electrode in the fifteenth interval T15 is (1, 1, 1, 1, 0, 1, 0, 1, ⁇ 1, 0, 0, ⁇ 1, 0, 0, 0).
  • the driving signals which are transmitted to each of the driving signal electrodes in the same interval may include both of a driving signal having a positive (+) sign and a driving signal having a negative ( ⁇ ) sign.
  • the driving signals are shown in the form of a square wave, there is no limit to this.
  • the driving signals may be shown in the form of a sine wave, a triangular wave and the like.
  • FIG. 4 is a circuit diagram showing a connection relationship among the node capacitor, the driving signal supplier and the sensing signal part, all of which are shown in FIG. 1 .
  • the driving signal supplier 200 may include a plurality of driving circuits 211 , 212 , 213 , 214 , . . . , 21 n .
  • the plurality of driving circuits 211 , 212 , 213 , 214 , . . . , 21 n may be connected to the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and transmit the driving signal.
  • the sensing signal part 300 may include a plurality of sensing circuits and may detect the capacitances of the node capacitors C 11 , C 21 , C 31 , C 41 , . . .
  • the sensing signal part 300 is connected to the controller 400 and transmits the signal corresponding to the capacitance of the node capacitor C 11 , C 21 , C 31 , C 41 , . . . , Cn 1 to the controller 400 , so that the controller 400 is able to identify information corresponding to a touch location.
  • the capacitances of the node capacitors C 11 , C 21 , C 31 , C 41 , . . . , Cn 1 which are transmitted through the first sensing signal electrode RX 1 , are detected. Therefore, only a first sensing circuit 311 has been shown among the plurality of sensing circuits. However, there is no limit to this.
  • One end of the first node capacitor C 11 is connected to the first driving circuit 211 through the first driving signal electrode TX 1 , and the other end of the first node capacitor C 11 is connected to the first sensing circuit 311 through the first sensing signal electrode RX 1 .
  • One end of the second node capacitor C 21 is connected to the second driving circuit 212 through the second driving signal electrode TX 2 , and the other end of the second node capacitor C 21 is connected to the first sensing circuit 311 through the first sensing signal electrode RX 1 .
  • One end of the third node capacitor C 31 is connected to the third driving circuit 213 through the third driving signal electrode TX 3 , and the other end of the third node capacitor C 31 is connected to the first sensing circuit 311 through the first sensing signal electrode RX 1 .
  • One end of the fourth node capacitor C 41 is connected to the fourth driving circuit 214 through the fourth driving signal electrode TX 4 , and the other end of the fourth node capacitor C 41 is connected to the first sensing circuit 311 through the first sensing signal electrode RX 1 .
  • one end of the n th node capacitor Cn 1 is connected to the n th driving circuit 21 n through the n th driving signal electrode TXn, and the other end of the n th node capacitor Cn 1 is connected to the first sensing circuit 311 through the first sensing signal electrode RX 1 .
  • the first sensing circuit 311 may sum up the capacitances of the node capacitors of the node capacitors C 11 , C 21 , C 31 , C 41 , . . . , Cn 1 formed by the plurality of driving signal electrodes TX 1 , TX 2 , . . . , TXn ⁇ 1 and TXn and the first sensing signal electrode RX 1 , and then may convert the summed result into a digital signal and transmit to the controller 400 . Through use of the summed result converted into the digital signal, the controller 400 may determine the capacitances of the node capacitors C 11 , C 21 , C 31 , C 41 , . . .
  • the first sensing circuit 311 may further include an amplifier 311 a for summing up the capacitances of the node capacitors C 11 , C 21 , C 31 , C 41 , . . . , Cn 1 and may further include an A/D converter 311 b for converting the result summed up by the amplifier 311 a into the digital signal.
  • the amplifier 311 a may include an OP amplifier 312 , a capacitor Cf and a reset switch Rst.
  • the capacitor Cf is disposed between the output terminal and the negative input terminal of the OP amplifier 312 .
  • the reset switch Rst is connected in parallel with the capacitor Cf.
  • the negative input terminal of the OP amplifier 312 is connected to the first sensing signal electrode RX 1 and receives a signal of the capacitance transmitted from the node capacitors C 11 , C 21 , C 31 , C 41 , . . . , Cn 1 .
  • the sensing signal part 300 may sum up the capacitances of the node capacitors C 11 , C 21 , C 31 , C 41 , . . . , Cn 1 , which are transmitted through the sensing signal electrode.
  • the phases of the driving signals which are simultaneously applied may be the same as each other.
  • the capacitances of the node capacitors are summed up with the same sign, so that the sum of the capacitances of the node capacitors may be the same as a sum of the absolute values of the capacitances of the node capacitors. Therefore, the sum of the capacitances of the node capacitors has a very large value.
  • the signal output from the sensing signal part 300 may be represented by the following equation (4).
  • Vout V tx ⁇ ( C ⁇ ⁇ 11 + C ⁇ ⁇ 21 + ... ⁇ ⁇ C n ⁇ 1 ) Cf equation ⁇ ⁇ ( 4 )
  • Vout represents a voltage of the signal output from the amplifier 311 a to the A/D converter 311 b .
  • C 11 , C 21 , . . . , Cn 1 represent the capacitance of the node capacitor.
  • Cf represents a capacitor which sums up the capacitance of the node capacitor in the amplifier 311 a.
  • the voltage of the signal output from the amplifier 311 a to the A/D converter 311 b is proportional to the sum of the capacitance of the node capacitor and is inversely proportional to the capacitance of the capacitor Cf of the amplifier 311 a . Therefore, the more the number of the driving signal electrodes to which the driving signal is simultaneously driven is, the more the voltage of the signal output from the amplifier 311 a to the A/D converter 311 b may become very large. Accordingly, by use of the capacitor Cf which is used in the amplifier 311 a and has a large capacitance, it is possible to lower the voltage of the signal output from the amplifier 311 a to the A/D converter 311 b .
  • the size of the capacitor Cf should be larger. Due to the large size of the capacitor Cf, there is a problem that the size of the sensing signal part 300 becomes larger. Therefore, there is a requirement that the voltage of the signal output from the amplifier 311 a to the A/D converter 311 b is reduced without increasing the size of the capacitor Cf.
  • the driving signal when the driving signal is generated in response to the codes shown in FIG. 3 a , the driving signals of which phases are not the same may be included among the driving signals which are simultaneously applied.
  • the capacitances of the node capacitors are summed up with the different sign, so that the sum of the capacitances of the node capacitors may be less than the sum of the absolute values of the capacitances of the node capacitors. Accordingly, even if the size of the capacitor Cf of the amplifier 311 a is not increased, it is possible to lower the voltage of the signal output from the amplifier 311 a to the A/D converter 311 b.
  • FIG. 5 is a flowchart showing a method for detecting an input in the touch panel input device shown in FIG. 1 .
  • the driving signals are applied to the plurality of the driving signal electrodes, in the first interval, it may be controlled that the driving signal is applied simultaneously to the at least two of the plurality of the driving signal electrodes and the driving signal is not applied to at least one driving signal electrode. It may be controlled that one of the driving signals which are applied to the at least two driving signal electrodes has a phase difference from the other driving signals (S 500 ).
  • the phase difference may be 180 degree.
  • the driving signal is not applied to at least one of the driving signal electrodes to which the driving signal has been simultaneously applied in the first interval, and the driving signal is simultaneously applied to at least two driving signal electrodes, among the plurality of the driving signal electrodes, including at least one of the driving signal electrodes to which the driving signal has not been applied in the first interval, wherein, one driving signal among the driving signals which are applied to the at least two driving signal electrodes may be controlled to have a phase difference from the other driving signals (S 510 ).
  • the phase difference may be 180 degree.
  • the first sensing signal including the information on the capacitances of the node capacitors, which have been summed up in the first interval, and the second sensing signal including the information on the capacitances of the node capacitors, which have been summed up in the second interval can be detected (S 520 ). Also, it is possible to determine the capacitance of each of the node capacitors by comparing the first sensing signal with the second sensing signal (S 530 ).
  • the combination of the driving signal electrode to which the driving signal is applied and the driving signal electrode to which the driving signal is not applied may correspond to a Pseudo-Random Bit Stream (PRBS) code.
  • PRBS Pseudo-Random Bit Stream
  • the driving signals having a phase difference may be controlled to correspond to a code obtained by multiplying the PRBS code by ⁇ 1.

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CN110209300B (zh) * 2019-05-21 2023-03-28 广州视源电子科技股份有限公司 触控系统的驱动控制方法、装置、驱动装置及触控系统
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